Indicating device for radio receiving apparatus



L. L. BRIGGS. JR

INDICATING DEVICE FOR RADIO RECEIVING APPARATUS Original Filed Feb. 26, 1925 avwen'coz Louis L.l)1" J}, 85 hi5 flue (Maxi 1 a 4 WW Patented Aug. .10, 1926.

UNITED STATES PATENT OFFICE.

LOUIS L. DRIGGS, JR., OF NEW ROCHELLE, NEW YORK, ASSIGNOR TO ARTHUR DORSEY, OF NEW YORK, N. Y.

.INDICATING DEVICE FOR RADIO RECEIVING APPARATUS.

Original application filed February 26, 1925, Serial No 11,748. Divided and this application filed June 2, 1926. Serial No. 113,256. g

This application is a division of application, Serial No. 11,748 filed February 26,v

1925, and is concerned, in an apparatus of the character disclosed by said earher application with improved means for mountmg a dial and cover on a panel board.

' board of a receiving apparatus, are connected to the condenser and the variable inductance in such a manner that one may tune in for a desired wave length. These indicating dials have heretofore been marked only with numbers which have no particular significance, so that when one first sets up his receiving apparatus, it is necessary for him to hunt patiently for the'signals from various broadcasting stations and to note in a book the numbers on the dials which correspond with any given station with which his device is in tune. When he Wishes to listen in on a given station, he must refer to his notebook and then set the dial in accordance with the numbers therein found. If he loses the notebook or if it not readily available, then of course, his labor will have been lost and he cannot find any given station without going through the same experimental work of hunting for the correct setting.

It is accordingly the prime object of my invention to provide an indicating dial on which the operator may make suitable markings to indicate the different stations as he finds them, so that he may turn the dial directly to any given position representing roughly the wave length of a desired station, after which it is merely necessary for him to make a micrometer adjustment to get the exact wave length. I

'A further object is to improve the construction and design of such an indicating device and to provide a simple form which may be cheaply maunfactured and assembled, which permits ready replacement of the record blanks, and which is generally suitable for indicating the correct position for a variable device in aradio apparatus to tune it as desired.

With these and other object s in view as 1 on a panel.

from turning when the dial is moved, I may my invention resides in the combination of parts set forth in the specification and covered by the claims appended hereto.

Referring to the drawings which illustrate one modification of. my invention:

Figure 1 is a front elevation of still another modification; and

Figure 2 is a vertical section thereof.

As shown in the drawings the dial mem' ber 90 has a long centrally projecting boss 91 which is screw threaded on its end. This boss has a drill hole within which is fastened the post 92 of the adjustable apparatus such as a condenser by means of a set' screw 93 or other suitable means.

Arecord blank 94 rovided with a centrally located perforat on is placed over the boss on the indicating dial and may be fastened thereto by the very simple expedient illustrated, which comprises a flanged member 95 surrounding the boss and slidable' thereon which has an inwardly projecting, annular portion 96 arranged to ress against the inner portion of the record lank. This member 95 is held in engagement with the record blank by means of the knurled head 97 which is-threaded onto the end of the boss as illustrated. This member 97 serves also as means by which the record idicating dial may be turned. Knob 97 is suitably secured, as by cement, for example, to member 91, so as'to rotate with it, and with shaft 92. A key and keyway indicated at 98 may be provided to prevent the member from turning relative to the dial and thus injuring the record blank.

The cover for the indicating dial in this case comprises a member 100 which has an inwardly turned flange 101 arranged to be mounted against the' plane surface of a panel board. This cover 100 may be suitably fastened to the panel board and I have here indicated a construction wherein the cover may be held to the panel by means of the screw threaded knurled head 97. To this end I providea spring washer 102 which is resiliently clamped between the member 95 and the top of the cover 100. This washer is put under tension by screwing down the knurled head which, therefore, holds the cover assembled in a set position relative to the rest of the apparatus when it is mounted In order to keep the cover provide the :cover witha groove 104, the

sides of which engages the head-of a bolt 105 fastened to the panel 106. It will be understood that the cover will be held out ofcontact with the record blank by properly 1ocating the parts relative to the st 92 and thepanel 106 and the manner 0 assembling this device will readily be apparent also.

1 The cover is provided with'the windows 108 radio instrument a disk'adapted to be fastened to the shaft.

and rotatable with it tuning indicia carried witHI-said disk, a cdver plate mounted in front of the disk, a knob attachable to the shaft and provided with a bearing designed radio instrument having a rotatable shaft extending through a anel, which comprises a disk adapted to be astened to the shaft, a record blank removably attached to the face of said disk, a cover housing the dial and provided with an opening to permit writing memoranda on the blank, a knob attachable to the shaft and provided with a bearing designed to hold the cover against the face of the panel of the instrument and meafis for preventing the housing'from rotating when the knob on the shaft is turned.

3. An indicating radio apparatus having a panel and a shaft connected to variable device which aids in tuning to a desired wave length, comprising a rotatable disk connectable to said shaft, a record blank on said disk, a cover over the disk which has a centrally located aperture, and a'knob connected to the shaft through said aperture to turn the same, said knob also serving to exert a pressure which is transmitted to the to hold the cover plate against movemeng cover plate for holding; it in lace.

away-from the panel of the instrument, and

means for preventing'the plate from rotating when the knob on the shaft is turned.

' 2.A.n indicating device for use with a This s%ecification s gned "t 's 28 day of May A. 1926.

LOUIS L; names, Ja, 

